"She hasn't finished university, at least not in Ljubljana," he said. "My personal opinion is that, because she was very beautiful girl ... I believe that she realized that she could gain more with that, than to have long studies."

Vogelnik noted that his former student had passed a rigorous test to gain entry to the college, and based on that he believed "her IQ was very high."

Had she completed the course, Melania Trump's research would ordinarily be in the university's library, but it could not been found there when NBC News visited the college this summer.

In April, GQ magazine reported that she "decamped to Milan after her first year of college, effectively dropping out." The story included an interview with Melania Trump, as well as friends and former colleagues.

In July, after several other reports cast doubt over her resume claims, she pulled her entire website, saying in a tweet that "it does not accurately reflect my business and professional interests."